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Kernel: Move PhysicalPage classes out of the heap into an array

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By moving the PhysicalPage classes out of the kernel heap into a static
array, one for each physical page, we can avoid the added overhead and
easily find them by indexing into an array.

This also wraps the PhysicalPage into a PhysicalPageEntry, which allows
us to re-use each slot with information where to find the next free
page.
This commit is contained in:
Tom 2021-07-07 19:50:05 -06:00 • committed by Andreas Kling
parent ad5d9d648b
commit 87dc4c3d2c
11 changed files with 285 additions and 43 deletions
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11
Kernel/VM/PhysicalPage.cpp
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@ -12,16 +12,21 @@ namespace Kernel {
NonnullRefPtr<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist)
{
return adopt_ref(*new PhysicalPage(paddr, supervisor, may_return_to_freelist));
auto& physical_page_entry = MM.get_physical_page_entry(paddr);
return adopt_ref(*new (&physical_page_entry.physical_page) PhysicalPage(supervisor, may_return_to_freelist));
}
PhysicalPage::PhysicalPage(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist)
PhysicalPage::PhysicalPage(bool supervisor, bool may_return_to_freelist)
: m_may_return_to_freelist(may_return_to_freelist)
, m_supervisor(supervisor)
, m_paddr(paddr)
{
}
PhysicalAddress PhysicalPage::paddr() const
{
return MM.get_physical_address(*this);
}
void PhysicalPage::return_to_freelist() const
{
VERIFY((paddr().get() & ~PAGE_MASK) == 0);